Manufacture of dull luster artificial silk



Patented Aug. 15, 1933 MANUFACTURE OF DULL LUSTER ARTIFICIAL SILK Martin Wadewitz and Richard Elssner, Elizabethton, Tenn, assignors to American Glanzstoif Corporation, New York, N. Y., a Corporation of Delaware No Drawing. Application September 30, 1932 Serial No. 635,604

9 Claims. (Cl. 10640) Our present invention has to do with a new and novel method for obtaining an artificial silk filament possessing a dull or mat appearance.

More especially, the invention concerns a o method for producing dull luster yarns from viscose solutions.

One object of the present invention is to provide a dull luster filament which will present an appearance equivalent in dullness to that prepared by any other known method, yet wherein as great a quantity of dulling agent will not be required.

Another object is to provide a method for dulling the luster of artificial filaments without affecting the strength and elongation thereof.

Other objects will become apparent from a study of the following specification and claims.

Our main dulling agent is diphenyl in combination with pine oil or other fugitive dissolving agents, for example, carbon disulphide.

The preparation of diphenyl, C6H5.C6H5, is well known and need not be set forth here. See, for example, Berthelot in Zeitschrift fuer Chemie, 1866, page 707; Berichte der deutschen Chemischen Gesellschaft, volume 9. page 547; Liepigs Annalen der Chemie, volume 230, page 5; etc.

Mainly, we have found that diphenyl alone gives a good delustering efiect on artificial silk filaments. We have found, for example, that through the use of only 2.5% diphenyl we can obtain a delustering efiect better than that produced through the use of 4.5% kerosene or 5% monochlorbenzene or 5% pine oil, when used alone. When diphenyl is used in a concentration of from 67% (calculated on the cellulose content of a viscose solution), for example, we have obtained a dulling equivalent to that obtained from the use of 1.5 to 2.0% titanium dioxide. Further, the objectionable chalky appearance of yarns delustered by titanium dioxide is not present, and our new yarn is white in color.

The dulling efiect of diphenyl is increased when we mix with it a small quantity of a fugitive organic compound, such as pine oil.

In all cases where we refer to the percentages of diphenyl and the other chemical compounds, in the specification and in the claims, reference is made to a percentage calculated on the cellulose content of the spinning solution employed. Also, cellulose Xanthate and a cellulose xanthate solution are considered to be synonymous with viscose or a viscose solution.

In the list which follows, each succeeding percentage listed has been found by us to give a greater dulling effect than the percentage preceding:

Per cent Diphenyl 5.0 Dipnenyl plus 6.0% pine oil 3.0 Diphenyl 7.5 Diphenyl plus 6% pine oil 6.0

We have also found that the physical properties of the filaments are not impaired to any great degree when either diphenyl or diphenyl and pine oil are used.

Example I.To a 1000 liter batch of a viscose solution containing about 7.5% cellulose and 6.8% sodium hydroxide, as a delustering agent we add 5 kg. of diphenyl dissolved in 8 liters of benzene.

Example II .-To the viscose solution noted in Example I, we add 5 kg. of diphenyl dissolved in 5 liters of pine oil and 2 liters of benzene.

These two specific examples are merely illustrative of the manner in which we may carry out our new process, and we do not wish to be limited other than by the appended claims.

Having now set forth our invention as required by the patent statutes, what we desire to claim is:

1. As a spinning solution for artificial filaments, a cellulose Xanthate containing diphenyl.

2. As a spinning solution for artificial filaments, a cellulose xanthate containing diphenyl and pine oil.

3. A viscose solution for use in the production of low luster filaments, films, etc., containing at least 2.5% of diphenyl.

4. A viscose solution for use in the production of low luster filaments, films, etc., containing 10% or less of diphenyl.

5. As a spinning solution for artificial filaments, yarn, and the like, a viscose solution containing approximately 7.5% cellulose, and diphenyl in an amount less than 10%.

6. As a spinning solution for artificial filaments, yarn, and the like, a viscose solution containing approximately 7.5% cellulose, and diphenyl in an amount less than 10%, the diphenyl being dissolved in benzene.

9. A spinning solution for use in the manufacture of artificial yarn comprising 1000 liters of viscose with a 7.5% cellulose and 6.8% sodium hydroxide content and 8 liters of benzene containing 5 kilograms of diphenyl.

MARTIN WADEWITZ RICHARD ELSSNER. 

